Process of making gold pigment.



by' grinding with a resinous balsem in the To all it may concern.'

' citizen-0f the United states, residing anche UNITED STATES PATENT OFFICE.

.roHN w. nessuno', for. cursado, -riLINoIsp- I recense Vor nannte conn rIeMENT.

1,057,422. No Drawing;

Be it knownthat I, JOHN W. HASBRG, a

' cago, in the county of Cook and .State of Illinois, have invented certain new and useful Improvements in Processes of Making. Gold Pigment, of .which the following is a*4 'specilication My invention' relates to' improvements in provi process for reduclng' gold to its finest pos-V gol'd saint, and has for. one of its objects to ev an easily manipulated and simple s sible comminuted'state, t-hereby to produce a smooth, uniform, and easily to bemanipulated, product, capable of covering a relatively large surface as when gold is usedin paint, especially'for ceramic and' glass deco-n ration. -V

.quantity ofa-n al ali, such for instance as potassium. h droxid. The eiiect of .thls, 1f

carefully a ded, is to form a precipitate which, however, redissolves as this alkali be'- comes; in excess, as indicated bythe fact that a pieceof red litmus paper placed in thesol'ution is strongly turned .to blue. To this solution mercurous nitrate is now added i i until no further precipitate forms. The pre- 4o cipitate is now separated from 4the liquid and preferably washed and then treated w1th an excess of acid, for example nitric acid, which dissolves an mercury .compounds in the precipitate an '.it -is then thoroughly washed.

By this treatment the gold is left vin ank exceedingly fine amorphousv condition, which is mixed with a suitable flux such as the oxid,

' hydroxid, or -subnitrate of bismuth. o r .the

' vberate or oxids of lead -or otherY like metallic compounds and prepared foruse as a paint usual manner.

I have here given a preferred method but Spieaeatlon.` ot Letters' Patent. Application med munter 1s, 1911.

ess of makin' lmetallic salt, and then a sriain. ssoazos.

m'ercurous nitrate as a precipitant andfsome other alkali, such as sodium hydrate or the ferrous sulfate may be employed instead of Patented Apr. 1, i913.

carbonates of the alkalis may be used.'4 -v Also, in caseswhcre ferrous sulfate is. em-

ploycd, sulfuric acid! instead of nitric acid may be used.

I do not wish to confine myself to precise quantltles' or procedure but any one skilled readily produce the product iu the artcan described.

'Havinvr Ifully described my' invention, what' Iclaim and desire to sec'ure by Letters Patent, is;

l, The herein described steps in the process of making gold pigment which consist 1n adding a hydroxid, carbonate .or bicarbonate ofan alkali meta-l to a solutionof gold y chlorid and then precipitating the gold with a metallic salt.

' 2. The herein described' vsteps in theproc, t

in adding a bonate, of an alkali to asolution of gold clilorid, then precipitatin the gold with a solve the precipitated basic metal oxid 'from the gold.

3. The herein described steps .the process of making gold'- igment'which convsist in.adding ahydroxid, carbonate orbi- .carbona'te 'of an alkali to a solution ofgold chlorid, then precipitating the gold with a f metallicv salt, washing the precipitate so formed, then addingan acid to dissolve thev precipitated .basic metal oxid, washing and drying the'resultant precipitate, and adding gold pigment which consist. ydroxld, carbonate or bicar-4 ng'an acid to dis'- a flux containing lead borate -to the gold 'residue.

v4. The process of making gold pigment wlnch consists in-adding'a hydroxid', carbonate or ybi.

herein described steps in lthe carbonate of an alkali in excess to a Isolution of gold chlorid, then adding to said gold sola.- tion a metallic saltprecipitant and then adding an'acid to dissolve the precipitated basic .metal oxid from'the gold.

In testimony whereof yI iereunto set my hand inthe presence of two witnesses.

u JOHN-w.- HASBURG. l

I n the presence o f-' Maar F. ALLEN, l W. LINN Amun. 

